Dynamic DropDown Retrieval

This program allows a particular user to Dynamically update the values of drop down list. For Example we genrally see in many websites for regsitration purposes there would be a drop down box for Country , So now if we select a country in that the page must dynamically update and must fetch the states related to that country. My Sample program will explain how to do this simple task.//In Default.aspx.cs page type the below code :